Cymbalinename of a More album song
The actual name is not Cymbaline, as stated by Roger Waters, but Cymbeline. It is the name of a Shakespeare play, its full name is The Tragedy Of Cymbeline, King Of Britain.
Cymbeline was a real person. He was an English army leader called Cunobelinus, who ruled England before it was invaded by the Romans.
Why the name was used in the lyrics, which have nothing to do with Cymbeline, is not clear.